Tool-rest for hand-lathes



(No Model.)

E. RIVBTT.

TOOL REST FOB, HAND LATHES.

No. 888,012. Patented Sept. 4, 1888.

'/ f M.' El I 'i 'i wa? ihvTTnn STaTns PaTnnT Orifice.

EDVARD RIVETT, OF BOSTON, lllASSAOHUSE-TTS.

TOOLREST FOR HAND-LATHES.

SPECIFICATION forming part of Letters Patent No. 389.012, dated September e, 1888.

(No model.)

To all whom it may concern:

Be it known that I, EDWARD ltrvnrr, a citizen of the United States, and a resident of Boston, in the count;7 of Suffolk and State of Massachusetts, have invented new and useful Iniprovements in Tool-Rests for Lathes, Sie., of which the following, taken in connection with the accompanying drawings, is a specification` This invention relates to improvements in tool-rests for lathes, it being particularlyT designed for use on watch-makers or smaller lathes, although it may be equally useful for lathes or machines of other constructions.

The invention is carried out as follows, reference being had to the accompanying draw ings, wherein- Figure l represents a side elevation of the improved tool-rest Fig. 2 represents a sectional elevation oi' the saine. Fig. 3 represents a plan View of the sliding base-plate. Fig. et represents a bottom view of the eccentric clamping ring or head. Fig. 5 represents an end view of the invention, showing the eccentric clamping-ring in section. Fig. 6 represents a cross-section of the clamping-sleeve on the line A B, shown in Fig. 5; and Fig. 7 represents a crosssection of the lower part of such sleeve on the line C D, also shown in Fig. 5.

Similar letters refer to similar parts whereever they occur on the different parts of the drawings.

a is the base-plate, having on its under side a T-hcaded groove, a', for the reception of the head of the usual fasteningbolt, as is con'nnon in lathes and other machines.

b is the hollow post, extending upward from the plate (t, such post being preferably made in one piece with the base-plate a, as shown in Fig. 2; but, if so desired, it may be made separate and secured in a suitable man ner to the said base-plate. The post Z) extends upward as a clampingsleeve, b', having a reduced upper portion, b", the periphery of which is turned eccentric relative to the periphery of the sleeve b', as shown in Figs. 2, 3, and 5. i

c is the rest, as usual, having the down- Wardlyprojecting spindle c, that is of cylindrical form, and adapted to be inserted in a cylindrical vertical perforation, b, in the clampingsleeve and its post, as shown in Fig. 2. The clamping-sleeve b and its upper reduced and eccentric portion b is slitted vertically `at Z1, as shown in Figs. 3 and 5, to permit said clamping-sleeve to yield slightly, so as to clamp the spindle c rxnly within it in any desired position.

b5 is a horizontal slit through about onehalf of the sleeve b, as shown in Figs. 2, 5, and 6, which slit communicates with the vertical slit b, and serves to permit the reduced eccentric sleeve portion b to yield independently of the larger portion, b', in clamping said parts around the spindle c. The sleeve portion b also has a horizontal slit, b, at its base, which slit extends about hall' around the pe riphery of said sleeve b and communicates likewise with the vertical slit li", as shown in Figs. 2, 5, and 7, by which said sleeve portion b' is rendered yielding.

l is the clamping ring or head, having in its lower portion a bore, d', of the saine size as the outside of the sleeve portion li', and having in its upper end a reduced bore, d", ol" the saine size as the reduced sleeve portion b. The bore d is made eccentric relative to the bore d in the same relative proportion as the sleeve portion b is made eccentric to the portion b.

d3 is a stop-pin driven through a horizontal perforation in the side of the lower portion of the head or ring d, its inner end projecting into the horizontal slit b ou the sleeve portion b', which pin serves the object of preventing the ring or head cl from getting detached from the post b, and also serves to liniit the turning of the said head around its axis relative to said post Z) when the spindle c' is to he clamped Within the sleeve b b" or released therefrom.

Then the parts are in the positions shown .j

in the drawings, the spindle c' may he adjusted up or down or turned freely around its axis within the sleeve b b to suit requirements of the operator. To secure said spindle firmly to the post b and its sleeve b' b, it is only necessary to take hold of the ring or head d and to turn it slightly around its axis in either di rection, when the eccentricity of the sleeve b and bore d causes the split sleeve Zi b" to bind around the spindle c', and thus keep it firmly in the desired position. By turning the ring or head d back again to the position shown in IOS the drawings the spindle c is released from the grip of the sleeve b b, and may then be again adj usted to any desired position to snit the Wishes of the operator, and so on.

What I wish to secure by Letters Patent and claim isl. The hollow post b, having the upwardlyprojecting sleeves b b arranged eccentrically one relative to the other, and provided with slits b, b5, and b, combined with the head or ring d and its bores d d, arranged eccentrically one relative to the other, as and for the purpose set forth.

2. The post b and its slitted sleeves b b, ar-

ranged eccentrically, as described, the spindle c', and the ring or head d,\vith its eccentrically- 

